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20 March, 19:47

A boy is 17 years old and his sister is twice as old. when the boy is 23 years old what will be the age of his sister?

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  1. 20 March, 21:05
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    Well if he is 17 and she is 2 and old then she would be 34. Now add 6 years to 17 and that is 23 so now just multiply 23*2 = 46, so when he is 23 she will be 46 year's old.
  2. 20 March, 21:20
    0
    Boy = 17 years.

    Sister = 2*17 = 34 years.

    When the boy is 23, that is 17 + 6 = 23, in 6 years time.

    The sister will be: 34 + 6 = 40 years old.
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